Honing arbor



June 6, 1 SUNNEN HONING ARBOR.

Filed Jan. 2l, 1942 2 Sheets-Sheet 1 mw t wuwvtofr/ JOSEPH SUNNEN www;

June 6, 1944.. SUNNEN 2,350,969

' HONING ARBOR Filed Jan. 21. 1942 2 Sheets-Sheet 2 o Patented June 6,

' UNITED STATES PATENT oFFicE Joseph Sonnen, Clayton. Mo. ApplicatioilioJznrsy. 21(,C)N0. 427,654

The main object of this invention is to construct a hone carrying mandrel so that any number of hones may be carried in a manner permitting a maximum adjustment for the size of the mandrel and at the same time maintain the strength and rigidity of the assembly.

Another object is to so construct a mandrel and hones therefor that the adjusting means for each hone will be independent to permit tandem spacing and at the same time will support the hone elements in a manner preventing misalinement laterally or radially not only during adjustment but also during honing operations.

A further object is to provide cooperating guides between the mandrel and hone carriers of a character which will permit constant adjustment during a honing operation by means of automatic resilient adjusting means independent of the mandrel assembly.

Other inherent features of the assembly include the compactness of the assembly permitting accurate adjustment, interchangeability of parts, and particularly interchangeability of the hone elements, and maximum adjustment in proportion to the diameter of the mandrel which latter is especially desirable in the finishing oi holes of small diameter.

More speciiically, the present device includes a mandrel body formed with a longitudinal recess defined in part by relatively deep side walls, a thin longitudinally slidable actuating bar arranged to abut one of said side walls, the bar having angularly arranged parallel sets of guide slots extending from the top to the bottom thereof, and individual hone members arranged in tandem in said slot, each with portions interengaging in a set of slots, so that the individual hones will respond radially to the longitudinal movement of the bar.

Other objects will more clearly hereinafter appear by reference to the accompanying drawings forming a part of the speciiication and wherein like characters of reference designate corresponding parts throughout the several views in which- Fig. 1 is a top plan view partly in section.

Fig. 2 is a longitudinal section.

Fig. 3 is a transverse section on line A-A.

Fig. 4 is a transverse section on line B-B.

Fig. 5 is an enlarged elevation of the actuating bar.

Fig. 6 is an exploded viewwith some of the parts enlarged, and

Fig. 7 is a side elevation of a grinding machine embodying the present invention.

The mandrel includes the separable head A and the elongated recessed body B, the head being reduced in diameter at I to form the annular shoulder 2 to provide .an abutment for en-4 gagement with the outer end ilb of the spindle socket 4 as shown in Fig. 7. The grinding machine illustrated in Fig. 7 cooperates with the mandrel and will be hereinafter described. The head Als formed at its outer end portion with an axial socket 5 to receive the enlarged end 6 of the mandrel body B, the latter being secured in position by suitable means such as the spaced screws 6', which latter are threaded through the head into the body in the manner shown. The inner end of the head A is recessed as at 1 and this recess 'I and the socket 5 are, connected by the longitudinal slot or recess 8 to facilitate the arrangement and interchange of the parts and particularly of the slidable actuating bar shown more fully in Fig. 5.

The mandrel body B is recessed or slotted longitudinally, the recess being relatively deep and wide to receive the adjusting bar 9 and the hone I0, it being understood that the dimensions of the slot are such as not to reduce the needed strength of the structure but at the same time permit maximum adjustments of the cooperating parts. The mandrel body B is enlarged intermediate its extremities to provide a relatively heavy working portion for the reception of the Working parts. It will be noted that the side Walls I4. and I5 deilning the slot in the mandrel body I are parallel and substantially flat to provide elongated substantial seating surfaces for associated parts. The bottom I6 of the slot is uninterrupted and as in the case of the side Walls I4 and I5 extends in a common plane throughout its entire length with the walls of the recess in the head A. Within the elongated slot in the mandrel body is arranged the thin slidable actuating bar 9, the width of which is substantially less than onehalf the width of the slot in the mandrel body. It will be noted that this bar 9 when seated on the bottom of the slot does not fully extend t0 the peripheral surface of the mandrel. The outer face I1 of this adjusting bar is hat and is adapted to coextensively abut one ofthe side walls of the slot to insure a rigidly controlled relative movement therebetween. lThe other sidewall of the adjusting bar is formed with suitable parallel guideways or guide members, in the present instance illustrated as slots I8, these slots being in groups and extending the entire height of the bar, so that when the bar is seated in the slot in the mandrel they will be continuaandoen below the upper surface thereof to form a supporting face 28 which is adapted to rest upon the top of the head of the screw 21 to limit the downward movement thereof with respect to the slot I4. I'he length of this vertical slot 28 will determine the amount which the working surface 28 of the hone projects above the peripheral surface of the mandrel, or in other words the vertical guide slots 28 will define the amount of retraction of the individual hone members within the slot i4 of the mandrel body. Normally 4 the hone elements will be capable of retraction The top surface of the adjusting bar is notched at i9 to provide shoulders 20 which cooperate with the stop 2i to limit the axial movement of the same and thus the radial movement of the hones. The stop or retainer 2l includes a body 22 of elongated form and of a width to seat between the bar and the spaced side wall of the mandrel body, and from this body extends a lip 23 which overlies the top of the adjusting bar between the shoulders 20. A screw 24 is threaded through the mandrel body and into the body 22 of the stop member to hold the same against displacement. Thus the actuating bar is held against radial displacement and limited with -respect toits longitudinal movement to an extent represented by the distance between the stop members less the length of the stop element 22.

The hone elements may each include a holder or carrier and theabrasive element or stone. These parts are cemented or otherwise xed together to secure substantially a unitary structure and will now be so treated. Each hone is formed with a pair of guideways, in the present illustrationspaced elongated lugs or ribs 25 and 25', angularly arrangedand relatively positioned to seat in a pair of the slots I8 formed in the adjusting bar l1. Due to thereduced height of the adjusting bar intermediate the shoulders 2li- 20, it will be apparent that one end of one of the hones would become free from engagement with its slot before the other end reached its maximum adjustment. To provide against this condition one of the lugs 25 of each hone is relatively longer than the other. The structure and. relative vertical arrangement of the lugs 25-25' with respect to each other may be modified although the relation of these parts as illustrated provides satisfactory results. It will be noted that each hone is of such dimension as to snugly ilt within the unoccupied area of the slot in the mandrel B so that no lateral movement of any of the parts can occur and thus is formed a compact device which will inherently be of substantial strength and rigidity, although capable of the desired adjustments. The ribs 25 and 25' are formed on the inner surface of the hone` members, the outer surfaces being provided with vertical grooves on guideways 26 shown in Figs. 2 and 4, which engage the screw heads 21 extending inwardly from one face of the slot as shown clearly in Fig. 4. Any suitable means may be provided to accomplish thelfunction oi this part, the structure shown being preferable for convenience and replacement. The vertical grooves or guideways are of a height representing the full radial adjustment of the hones and keep the latter from moving longitudinally during sliding movement of the bar, which operation radially adjusts the hones.

It will be noted that the vertical grooves 26 extend from the bottom of the outer face at one end of each hone member and terminate yto such an extent that the outer portion of the v grinding machine forming a part of a zo-pend- `ing application and in which the operating mechanism is particularly adaptable to actuate the mandrel assembly herein shown and described.

This grinding machine includes the frame 3l in which is mounted the'rotary spindle 3l. the latter terminating in the socket 4 for driving connection with the head A of the mandrel. The spindle is driven by the motor 32 through the pulleys 33 and 34 and belt 35 and the regulation and control of this drive may be by any desired means. 'I'he actuator bar 8 of the mandrel is connected tothe rod 36 by locking engagement as shown in Figs. 1 and 2, the actuating bar being bent at its inner extremity to form hook 31 which engages hook 38 at the end of the slidable rod 35. The rod 35 extends axially through the spindle and is swivelled at its outer extremity by a swivel connection 33 intermediate the cross arm 40. The cross arm 40 is pivoted at its upper end to the adjusting rod by pivot pin 42, the adjusting rod being calibrated and controlled from the operating arm 43 to adjust the lever 48 and thus the movement of the actuator bar 8 in the mandrel. The lower end of the cross arm is connected by pivot 44 with the link 45 the latter having its opposite end eccentrically connected at 46to the stud shaft 41 fixed to the control lever 48. I'he control lever 48 is actuated by treadle 4! pivoted to a fixed support 50 and connected to arm 48 through the medium of a coiled spring 5l. Thus it will be seen that upon actuation of the foot treadle 49, the arm 48 will be moved downwardly by the spring connection 5l until the arm 48 contacts the lug 52, after which the movement of the lever 48 is permitted to lag by virtue of the expansion of the spring 5l. When the foot treadle 49 has reached its lowermost position indicated by dotted lines in Figure 'I the spring will be substantially expanded and the loading of the spring in this manner will result in a continued movement of the actuator bar 9 through the connecting linkage shown to an extent represented by the linut of movement of the arm 48. The-movement of the arm 48 is limited by its contact with the lug 52 on the crank arm 53 of the connecting rod 54 which latter actuates the retarding mechanism 55. The structure of the retarder forms apart of a separate application and this retarding mechanism is so constructed and arranged that the connecting rod 54 will be limited in its downward movement by engagement of the connection 55 with the top 51 of the retarder cylinder. By this arrangement the extent and force of the radial movement of the hones I0 by the actuating bar 8, through the rod 58, cross arm 40, link 45. lever 48, spring I and treadle 49 will be. determined by the relative adjustment between the retarding mechanism 55, crank arm 53, lever 48 and the treadle 49 taken y in conjunction with the loading of the spring 5I.

By this arrangement it will be seen that the initial radial adjustment of the hones is comparatively rapidly produced by the actuation of the treadle 49, and when the hones approach work engaging position as determined by the retarder mechanism 52-51 etc., the resistance of the movement of the hones through the working operation and the resistance of the retarder mechanism will result in an expansion of the preloaded spring 5| so that the energy stored therein by the continued treadle movement will bring about a continued movement of the hones through their working operation. 'Ihe feeding oi the hones i. e., the radial movement of the hones into the work being the direct result of the energy stored by the loading of spring 5I it is essential that means be provided whereby this radial movement will be substantially constant. That is to say, it is important due to the nature of the energy used in feeding the hones during a portion of their movement that means be provided whereby the hone adjustment will not vary but will be constant at all times. This means is to be found in the present case in the provision of the parallel spaced diagonal slots I8 which are so positioned as to cooperate with the projections of the hones in such a manner as to fully control radial movement thereof.

Generally the retarding mechanism, i. e., the uid retarder 55 will function to limit the direct radial expansion of the hones by treadle movement to a point at which the hones are about to engage the work, this point of engagement and other adjustments and controls being the subjectmatter of a co-pending application. The resistance of the retarder 55 to the treadle movement results in the expansion of the preloaded spring 5I, and the energy thus built up will eiectually continue the hone movement to a predetermined limit as determined by the adjustment of the retarder mechanism. Thus it will be seen that in the arrangement shown and described provision is made to secure maximum rapidity and accuracy of adjustment of hone members in a mandrel of limited diameter, without unduly reducing the strength or rigidity of the assembly. Also it is practical to arrange hone elements in tandem in a mandrel, either in spaced or abutting relation with the individual hones supported at spaced points and subject to collective or individual adjustment as may be desired.

What I claim is:

1. A tool of the class described, a mandrel formed with a longitudinal slot in its outer surface, said slot being defined in part by spaced parallel side walls, a slidable relatively thin adjusting bar having one face formed for coextensive engagement with one of the side walls of said slot, the opposite face of said bar being formed with spaced inclined guiding portions, a hone positioned in said slot in sliding and mutually supporting contact with said last named face of said bar and having guiding portions engaging the guiding portions of said bar, means for securing said hone against longitudinal movement, and means for securing said adjusting bar against radial movement.

2. In a tool of the class described, a mandrel formed with an elongated slot defined in part by spaced side walls, a slidable adjusting bar arranged in said slot, said bar being formed with two ilat sides with substantially parallel edges, one of said sides snugly abutting one side wall of said slot and the other side being provided with angularly arranged parallel inclined guides, a hone member including a holder adapted to snugly ll the space between said bar and the adjacent side of said slot and including parallel inclined guides for engaging the guides carried by said bar, means for retaining said hone holders against longitudinal movement, and means securing said bar against radial movement.

3. In a tool of the class described, a mandrel formed with a longitudinally extending slot having spaced parallel relatively flat side walls, a relatively thin and broad adjusting bar arranged in said slot for longitudinal adjustment, said bar having one edge contacting the bottom of the slot and a parallel edge near the top of the slot, one side of said bar being adapted to abut one of the side walls dening said slot and the other side of said bar being formed with groups of spaced parallel angularly arranged slots, and hone elements arranged in tandem in said slot, each hone element being formed with groups of projections for cooperative engagement in its respective groups of slots in said bar, and means for securing said hone elements against longitudinal movement, whereby each of said hone elements will respond radially to movement of the bar member in relation to the angular arrangement of said inter-engaging parts.

4. In a device of the class described, an arbor formed with a channel having spaced Hat parallel walls, a hone expander mounted in said channel with upper and lower edges parallel and adjacent to the upper and lower edges of said channel and having one side face normally engaging one side face of said channel, the other side wall of said expander being formed with spaced parallel inclined grooves, a hone carrier mounted in said channel, said hone carrier being provided with spaced parallel ribs for engagement in said grooves, and means for holding said carriers against longitudinal movement.

5. In a device of the class described, a mandrel having a longitudinally disposed recess dened in part by relatively deep ilat side walls, a longitudinally slidable thin at actuating bar positioned in said recess against one of said side walls, said bar having parallel edges adjacent the upper and lower edges of a wall of said recess, a hone interposed between said actuating bar and the other side wall in snug and mutually supporting relation, portions of said hone interengaging with portions of said actuating bar, the interengaging portions being so constructed and arranged as to cause relative movement between the parts to be substantially constant, and means for causing relative longitudinal movement of the bar with respect to the hone.

6. In an expansible ,hone including a body formed with an elongated recess, an adjusting bar arranged for movement in said recess, said adjusting bar having a lower edge in sliding contact with the bottom of said recess and its upper edge parallel and adjacent to the upper edge of said recess, and being provided with pairs of spaced inclined partially superimposed guide portions, hone members arranged in tandem in said recess, said hone members each being provided with guide portions arranged for engagement with the inclined guide.. portions of said adjusting bar whereby axial movement of the adjusting bar wm radially shirt said nene members i an expansible hone, a body formed with awall of said groove, the opposite face of said bar engaging the adjacent hone face and the adja-` cent parts oi' said bar and hone including interengaging means responsive to relative longitudinal movement oi' the hone and adjusting bar to cause axial movement of said hone, said hone and adjusting bar together. snugly filling the space and lower edges of said recess, said adjusting bar being provided with pairs of grooves, said grooves extending at such an acute angle that they will be partially superimposed at their adjacent ends, and spaced pairs ot groove engaging lugs projecting laterally, from each of said hones and engaging in pairs of grooves in said adjusting bar, and means for holdingsaid hones against axial movement whereby adjustment of said bar will cause radial movement of said hone.

8. An adjusting bar `for expansible hones comi prisingla body member having a relatively long,

thin and at portion, and inclined guideways formed in one side oi'said flat portion, said guideways being arranged in pairs with portions of each pair overlying a portion oi the adjacent pair.

9. A hone arbor comprising a generally cylindrical shaft member, a longitudinal groove having parallel side walls cut in said arbor, a hone mounted in said groove in contact with one oi' said side walls. an adjusting bar mounted in said groove having one of its side faces in substantially co-extensive contact with the other side between th'e opposite sides ot said groove, whereby the shaft. the adjusting bar and the hone coopcrate to form a rigid assembly with the individual parts incapable of distortion.

` i0. A hone structure comprising a carrier having an abrasive medium secured to one oi' its faces, said carrier being elongated and having one oi its side faces flattened, 'there being spaced guide projections extending from the plane of such ilattened side face of said carrier, each of said projections having a longitudinal axis which isinclined with respect to the longitudinal axis ot such elongated carrier bar. and each of said projections having parallel upper and lower surface portions, the lower surface oi one projection lying in a plane, which is parallel to and superimposed upon, the plane of the lower surface of the other projection, said last named planes also being inclined with respect to the longitudinal axis o! said elongated carrier, one of said projections being longer than the other.

JOSEPH SUNNEN. 

